js如何设置浏览器缩放比例

js如何设置浏览器缩放比例

js如何检查浏览器缩放

sublime只是工具可以换其他编辑器 下面直接上代码

按钮触发事件这是缩小的效果点击查看

按钮触发事件这是放大的效果点击查看

function detectZoom (){

var ratio = 0,

screen = window.screen,

ua = navigator.userAgent.toLowerCase();

if (window.devicePixelRatio !== undefined) {

ratio = window.devicePixelRatio;

}

else if (~ua.indexOf('msie')) {

if (screen.deviceXDPI && screen.logicalXDPI) {

ratio = screen.deviceXDPI / screen.logicalXDPI;

}

}

else if (window.outerWidth !== undefined && window.innerWidth !== undefined) {

ratio = window.outerWidth / window.innerWidth;

}

if (ratio){

ratio = Math.round(ratio * 100);

}

return ratio;

};